Area code 664

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Area code 664 in the North American Numbering Plan covers Montserrat, a tiny British Overseas Territory in the Caribbean. The 664 telephone area code, standing for "MNI," was created during a split from the original 809 area code, which began permissive dialing 1 July 1996 and ended 1 June 1997.

A domestic call within Montserrat is seven digits. A call from another North American Numbering Plan country (such as the United States or Canada) requires 1-664- and the seven-digit phone number, in the same format as a domestic toll call.

At one time the small island of Montserrat was able to get by with only using four-digit phone numbers internally, as the first three digits after the former 809 area code were the same for everyone (491). As of May 2011, Montserrat has seven-digit numbers beginning with 236, 349, 410, 411, 412, 413, 415, 491, 492, 493, 494, 495, 496, 664, and 724.

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Montserrat area codes: 664
North: 268, 869
West: Caribbean Sea Area code 664 East: 268
South: Country code +590 in Guadeloupe
Saint Kitts and Nevis area codes: 869
Antigua and Barbuda area codes: 268

Coordinates: 17°36′45″N 62°16′53″W / 17.61250°N 62.28139°W / 17.61250; -62.28139